Alternatives of break-beam sensors (one-side implementation instead of both)

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shawnkhoo00

Joined May 30, 2019
1
Hi, I would like to know if there's any alternatives that can replace break-beam sensors in this situation — a gate that counts how many people has passed through using a sensor implemented on one side.
If there aren't any alternatives, can an ultrasonic sensor be used to replace the break-beam sensor? e.g. When a person passed through the gate, the ultrasonic sensor detects a pulse of nearby presence, which the signal is feed into the microcontroller and adds 1.
 

Yaakov

Joined Jan 27, 2019
3,187
What is causing the constraint of mounting the sensors? As @AlbertHall points out, standard retroreflective sensors can use passive reflectors on the far side, usually a retroreflector like an automotive reflector.

Optoelectronic proximity sensors use the light reflected from the object, but they have particular ranges because the optics have to be angled appropriately.
 
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